| Tancheon | |
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| Korean name | |
| Hangul | 탄천 |
| Hanja | 炭川 |
| Revised Romanization | Tancheon |
| McCune–Reischauer | T'anch'ŏn |
Tancheon (Korean: 탄천; lit. charcoal stream) is a stream in Gyeonggi Province and Seoul, South Korea. The stream is a tributary of the Han River. It begins in Yongin, Gyeonggi Province, flows through Seongnam, and eventually into the Han. It has a total length of 32.66 km (20.29 mi).
The area also serves as a large park, and there are paths for both walkers and cyclists on each bank with occasional foot bridges joining the two sides in addition to the bridges built for vehicle traffic. Along the paths there are many benches as well as exercise equipment. The whole area is extremely popular among local residents.